Stream update progress into a bar on the stack's row (0.42.0)

Update ran as a blocking POST with nothing to show but a spinner, so the
status added in 86c67df could only sit above the table as a banner.

Adds /ws/update/{stack_id}, streaming `compose pull` then `up -d` with
--progress json, and feeds it through the existing DeployTracker — the
same weighting the deploy console uses. The result renders as a progress
bar inside the stack's own row: percentage, phase label, and layer/byte
detail. Non-streaming actions (start/stop/restart/pull/down) reuse the
bar in its indeterminate form, so every row action looks consistent.

compose_service gains _stream_phase, shared by stream_up and the new
stream_update; a failed pull short-circuits before `up`.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016pMmFFkdfxkoYjcEcpZTa5

README.md

@@ -34,6 +34,13 @@ as intuitive as Dockge, as capable as Portainer for Compose workflows.
   console shows a **real progress bar** (download bytes per layer, weighted by
   layer size, then container create/start) plus a per-image bar; the raw output
   is kept below it and updates one line per layer instead of scrolling past.
+- **Inline update progress (0.42.0)** — hitting Update on a stack streams
+  `compose pull && up -d` over `/ws/update/{stack_id}` and folds it into a
+  **progress bar inside that stack's row** (same `--progress json` weighting as
+  the deploy console: "Pulling images · 3/7 layers · 88 MB / 190 MB"). Several
+  stacks can update at once — busy state and progress are tracked per stack, so
+  the rows advance independently. The REST `POST /api/stacks/{id}/update` stays
+  for non-interactive callers and as the fallback when no token is available.
 - **Monaco editor** — YAML editing with an `.env` tab and a **`docker run` →
   compose** converter.
 - **Dashboard** — system resource bar, stack grid with quick actions, and a
@@ -456,6 +463,7 @@ POST   /api/stacks/convert                       (docker run → compose)
 GET    /api/system/info | gpus | devices         GET /api/audit
 GET    /api/system/update                         POST /api/system/update (self-update)
 WS     /ws/logs/{stack_id}[/{service}]           WS  /ws/events
+WS     /ws/deploy/{stack_id}                     WS  /ws/update/{stack_id}
 ```
 
 ### Phase 2 endpoints